Lighting fixture for automobile use

Abstract

A lighting fixture for automobile use that includes a cylindrical surrounding wall arranged around an electric bulb at the rear of the lamp body, the cylindrical surrounding wall being engaged with the socket cover and having a plurality of slits arranged along an inner ledge or outer edge of the surrounding wall. The lighting fixture further including a plurality of engaging edges protruding from a body engaging portion formed on the socket cover, and a plurality of engaging claws formed in the body engaging portion.

What is claimed is: 
     
       1. A lighting fixture for automobile use comprising: a lamp body having a front face and a rear portion;   a lens connected to the lamp body for covering the front face of the lamp body;   an electric bulb attached to the rear portion of the lamp body to provide a source of light;   a socket cover attached to the rear portion of the lamp body;   a surrounding wall located proximate to the rear portion of the lamp body, the surrounding wall being engaged with the socket cover and including a plurality of slits arranged along an edge of the surrounding wall; and   engaging edges protruding from the rear portion of the lamp body, the engaging edges having positions and dimensions that correspond to the plurality of slits to allow the engaging edges to be formed simultaneously with the molding of the lamp body:   wherein the dimensions of the engaging edges are the same as those of the slits.   
     
     
       2. The lighting fixture for automobile use according to claim 1, further comprising a body engaging portion formed on the socket cover, the body engaging portion being engaged with the surrounding wall. 
     
     
       3. The lighting fixture for automobile use according to claim 2, further comprising a plurality of engaging claws formed on the body engaging portion, the engaging claws being engaged with the engaging edges. 
     
     
       4. The lighting fixture for automobile use according to claim 2, wherein the body engaging portion includes protrusions that elastically come into contact with, and are crushed against, the outer circumferential surface of the surrounding wall to create a waterproof seal. 
     
     
       5. The lighting fixture for automobile use according to claim 1, further comprising a reflecting surface formed on the inside of the lamp body. 
     
     
       6. The lighting fixture for automobile use according to claim 5, wherein the reflecting surface is composed of a paraboloid portion having a focal distance that is formed at a position inside the slits. 
     
     
       7. The lighting fixture for automobile use according to claim 1, further comprising an electric bulb engaging portion having protrusions that elastically come into contact with, and are crushed against, the outer circumferential surface of a base of the light source bulb to create a waterproof seal. 
     
     
       8. A lighting fixture for automobile use comprising: a lamp body having a front face and a rear portion;   a reflecting surface formed on the inside of the lamp body;   a lens connected to the lamp body for covering the front face of the lamp body;   an electric bulb attached to the rear portion of the lamp body to provide a source of light;   a socket cover attached to the rear portion of the lamp body;   a surrounding wall located proximate to the rear portion of the lamp body, the surrounding wall being engaged with the socket cover and including a plurality of slits arranged along an edge of the surrounding wall; and   engaging edges protruding from the rear portion of the lamp body, the engaging edges having positions and dimensions that correspond to the plurality of slits to allow the engaging edges to be formed simultaneously with the molding of the lamp body;   wherein the reflecting surface is divided into two portions having different focal distances.   
     
     
       9. A lighting fixture for automobile use comprising: a lamp body having a front face and a rear portion;   a lens connected to the lamp body for covering the front face of the lamp body;   an electric bulb attached to the rear portion of the lamp body to provide a source of light;   a socket cover attached to the rear portion of the lamp body;   a surrounding wall located proximate to the rear portion of the lamp body, the surrounding wall being engaged with the socket cover and including a plurality of Slits arranged along an edge of the surrounding wall;   engaging edges protruding from the rear portion of the lamp body, the engaging edges having positions and dimensions that correspond to the plurality of slits to allow the engaging edges to be formed simultaneously with the molding of the lamp body; and   a first venthole and a second venthole formed for permitting the ventilation of a lighting fixture space.   
     
     
       10. The lighting fixture for automobile use according to claim 9, further comprising a first ventilation pipe connected to the first venthole to permit the ventilation of the lighting fixture space. 
     
     
       11. The lighting fixture for automobile use according to claim 9, further comprising a second ventilation pipe connected to the second venthole to permit the ventilation of the lighting fixture space. 
     
     
       12. The lighting fixture for automobile use according to claim 9, wherein the electric bulb creates heat convection to assist the ventilation of a lighting fixture space. 
     
     
       13. A surrounding wall for an automobile lighting fixture lamp body, comprising: an inner and outer edge portion;   a plurality of slits arranged along either edge portion of the surrounding wall;   a rear end portion;   a plurality of engaging edges protruding from the rear end portion, the engaging edges having positions and dimensions that correspond to the plurality of slits to allow the engaging edges to be formed simultaneously with the molding of the lamp body;   wherein the dimensions of the engaging edges are the same as those of the slits.   
     
     
       14. The surrounding wall according to claim 13, wherein the slits are formed at positions along the inner edge of the surrounding wall. 
     
     
       15. The surrounding wall according to claim 13, wherein the engaging edges protrude from the rear end portion of the surrounding wall. 
     
     
       16. The surrounding wall according to claim 13, further comprising a plurality of ribs formed on the surrounding wall to brace the surrounding wall.